Heat-regulating system.



H. LEWIS, W. R. SCOTT & C. DELL. HEAT REGULATING SYSTEM.

APPLICATION FILED JUNE 1. 1916.

1 ,265,927'. Patented May 14, 1918.

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Charles Del Z.

IN VENTORS,

JTTORNEX I UNITED STA ES PATENT oFF oE.

many LEwIs, WILLIAMB. soo'r'r, AND CHARLES DELL; PITTSBURGH, PENNSYL- VANIA, ASSIGNORS To PITTSBURGH AUTOMATIC HEAT EEeULAToRcoMPANY, 0F

fl'PI TsB RGH, PENNSYLVANIA, A CORPORATION OF DELAWARE.

HEAT-REGULATING SYSTEM.

. companying eleotric. circuit, and thereby a method of regulating thesupply oft-fuel is provided for any particular-purpose, such as; for, instance the supply; of gas fora device fortoastingbread, which is usedin the acoompanyingdrawings to illustrateone use of. the system. 1

Thesame system j v of heatregulation canbe alpplied to various other purposes such as t we automatic regulation of the-temperature of the interionpf a building. 1':

In'thecaseofits use or application to a device ,for, toasting bread, the system is arranged so that after the'gas has vbeen supplied .to ,the burners forming part of the device for any; given interval of time, the Y thermostat will open the electric circuit'controlling the valve and shut ofl"- partially or wholly :thesupply of gas to said burners. By a slight manualoperationthe; system can be iagain started -and will automatically ceaseits function ofsupplying gas to the burners. when (the predetermined, time .inte ryal, is reached, as will be a more fully explainedt hereinafterrin this specification.

iIn the; accompanying drawings vI have illustrated oneucomplete example of the physical embodiment. of my invention, constructed accordingto-the best model have sofa r]. evised for the practical application of theprinciples of the invention g u figure v 1 is aalongitudinal; -vertical{ section through a device ,forg toasting bread, with my l leat I regulating system attached thereto. ig'.w 2; is a, vertical cross section, on line fl 'vpi -Eigi B isa side VlGWI of the valve-and eleotro magnet' used in my system of regulation, the valvebeing shown partly in section." I

Fig. this. an end view taken from the left Specification of Letters Patent.

Patented May 14, 1918.

Application filed June 1, 1916'. Serial No. 101,098.

' Fig. 5 is an end view of the electromagnet taken from the right of'Fig. 3. I

Fig 6 is a plan view of the'toastershown' inFig.l.

Fig; .7 used. 7 V I j Fig. 8 is a front view of same. Q I In the drawings 1 is a valve, 2 is an ele'c taro-magnet, 3 is adevice'fortoasting bread, 4 isa thermostat, 5,1 6 are the wiresleading from the thermostat to the terminals of the electro magnet, and 1 with" said thermostat and electro-magnet form an electric circuit when properly energized. 4 we Referring to the particular construction of the-valve 7 is 'the' valve seat, 9 -is a universal joint "in the valve stem I 10' designed to'renabl'e the'valve l to readily find a perfect-seat 'in-7. -The valve" stem l0 has a stulfing box-11, and an adjusting annular screw-threaded ring 11 adapted to engage threads on the stem, andcontrol the adjust mentof the topeningibetween the valve 1 and the'valveseat 7. A spring 8 surrounding the stem 10, and actingunder-and against the inside of the valve cap16, tends to keep-the'valve 1 on its seat 7, or as near to such position as the adjustment-set by 11ewi11 allow same: At the top the stem lOiis provided with avpinlQ, to which is pivotally connectedwa :lever' arm" '13. j The lever arm 13 I isiulcrumed at ltin' a vertical support 15,'the latter being screw-threaded into the top'of valve cap l6,-and-' the 7 ing dejvicee :Thelelectro-magnetQ is support ed on a cross-barfi and beneath same are twortemiinals 25 and 26:fleading= from the magnet, and towhich are attachedthe wires which lead. to :the thermostat. s i The Wire's 5iandi 6 are attaohedatQT and 28to p'oints onthe-thermostathtas shown. A cross-bar 29- passesabeneath the gas supply: line :20, and; t-wdbolts 30, 31, with nuts 32, 33 hold the twocross-bai's securely to; the gas pipe 20. The {gas pipe :211 has ifour branches ;:3 a a h ehember h t ing device 37, with perforations on their top surfaces which form exits for the gas, and at which points the gas burns to heat up the perforated metal walls 38 of the toaster 3. The heat from 38 serves to toast the bread 39 lodged in the cells t0. etl, 42 are wires which serve to keep the bread from immediate contact with the heated walls 38 and prevent charring of the bread.

The thermostat at comprises a frame l3 and a part 44 composed of two flat strips of different metals secured fiat-wise together and a tl'ected in different degrees by temper ature, and supported at 45 on the frame l3, but insulated therefrom. On the upper end of ski provision is made for connecting one of the wires 5 to a terminal 27, and the other wire 6 is connected to a terminal 28 on the base portion of frame 43. The latter carries an adjustable screw-threaded pin a6, which in its normal position is in immediate contact with 44. The thermostat is attached to the face of one of the metal end Walls 47 of the toasting device as shown in the drawm s.

lhe operation of the heat regulating system is as follows.- The time necessary to toast the bread is found by trial to be about two minutes, and by setting adjusting screw as of the thermostat to the desired length, also found by experiment with the device, the part 44' when heated to a certain point will retract its lower extremity from the contact point 46 as originally set, by the metal in 44 curling inwardly toward the frame $3 of the thermostat.

By adjusting the annular ring 11 the valve can be made-to remain on its seat 7 short distance as before described, thus allowinga small quantity'of gas to reach the burners E22, 23,;and act as pilot jetsat 34", 3'5; For purpose of illustration we will assume the gas is flowing. in small quantity from the source of supply, through the valve to the burners, which have been ignited"; As long as the electric circuit is kept open at 17, it is evident no more gas than will supply the pilot jets can pass the valve to the burners. If the armature 17' is pressed down manually on the pole of the electro-magnet for a few seconds, a full supply of gas will flow through: the valve 1 and the walls138 of the toasting device will become heated, and the thermostat being attached to the end wall 457 of samewill also become'heated'.

A difi'e'ren'ce ofp'otential is in tlrisway once established in the thermostat 45, and an electric current will. be generated in the circuit wires 5*, 6,'contactbetween 44 and 46* being their normal condition before they become heated. The hand can now beremoved from 18 and the electr c-magnet being energized by" the current will attract-l7 seci-u'ely to it,-thus-hold ingthe valve 1 wide open from itsseat 7. A single cell battery 60 may be included in circuit 5' containing thermostat 4 and magnet 2, as an additional electromotive force. The walls 3'8 of the toasting device will under these conditions continue to increase temperature to a red heat, thereby, toasting the bread. After a period of two minutes, or proper time interval a s before explained the metal 44; becomes afiected by the heat from the wall t? to such a degree that it will leave the screw 46, thereby breaking the electric circuit, in which case the magnet releases 17 and-the amount of gas flowing is reduced to the pilot jet quantity, as the spring 8 coiitained in the valve will compel the valve 1 to return toitfs seat 7, except for the amount the valve is permanently held open by theadjusting nular ring 11. l

All that is necessary is to manu uy eiose the circuit at 17 again and the "operatien is repeated as often as necessary.

When it isdesire'dto shut oil the pilot jet flow entirely, it is doneb closing the cock on the supply lineleading to pipe 21. This coclr is not shown on the drawings.

In adapting the system to the control of the temperature in a room, the armature is placed inintim'ate relation to the pole of the electro-mag'net, by adjusting the heigl'it of the fulcrum 14 so that the electric circuit will become energized as soon as the thermostat metal l't becomes electrically afiected by the surrounding temperature By adjusting the contact screw 46 the thermostat can be made to open the circuit any de sired temperature, the amount of' adjustment necessary being dterm-ined'by trial for various temperatures: In this way the valve can be closed or partially closed at any particular temperature, and the latter raga late'd. As soon as the temperature falls below the point at which the thermostat is set to'open, the connection at 53 will again be established by the cooling metal 414:, the circuit again becomes energi'zed,- more fuel is peratureof the r'oom'risesgto the predeter} mined point, and the thermostat actionwill take place once more to open the circuit and partially close the valve; Hence it' is seen below the-fuel supp-1y ipe; means fared 130 supplied to the heating deviceused, the temthat the operation is practically continuous,

justably holding the cross-barsto said pipe, heat produced by the fuel passing through said fuel supply and delivery line connected same.

to the aforesaid valve body, an electric cir- In testimony whereof We afiix our signacuit, means for utilizing the heat generated tures in presence of two Witnesses.

5 by the fuel for electrically affecting a. ther- HARRY LEWIS.

mostat, a thermostat to energize the electric WILLIAM R. SCOTT. circuit, and denergize same at a predeter- CHARLES DELL. mined time interval or temperature, and Witnesses: thereby control the flow of fuel through the J OHN F. SWEENY,

1 aforesaid valve, and regulate the amount of MARGARET H. LEFEBORER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

